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General Biology I: Macromolecules and Functional Groups

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  • Functional groups important to life

    Hydroxyl, carbonyl, carboxyl, amino, phosphate, and methyl groups are key functional groups that affect molecule properties and reactivity.

  • Dehydration reaction

    A chemical reaction that removes water to join monomers into polymers.

  • Hydrolysis

    A chemical reaction that adds water to break polymers into monomers.

  • Carbohydrates structure and function

    Composed of monosaccharides, disaccharides, and polysaccharides; provide energy and structural support.

  • Monosaccharides examples

    Simple sugars like glucose that serve as monomers for carbohydrates.

  • Disaccharides

    Two monosaccharides joined by a dehydration reaction, e.g., sucrose.

  • Polysaccharides examples and functions

    Starch and glycogen store energy; cellulose and chitin provide structural support.

  • Lipids structure and types

    Hydrophobic molecules including triglycerides, phospholipids, and steroids.

  • Triglycerides

    Fats composed of glycerol and three fatty acids; store energy.

  • Phospholipids

    Contain two fatty acids and a phosphate group; form cell membranes.

  • Steroids

    Lipids with a four-ring structure, e.g., cholesterol and anabolic steroids.

  • Protein levels of structure

    Primary: amino acid sequence; secondary: alpha helices and beta sheets; tertiary: 3D folding; quaternary: multiple polypeptides.

  • Amino acid

    Monomer of proteins; contains an amino group, carboxyl group, and side chain.

  • Peptide bond

    Covalent bond linking amino acids in a protein.

  • Denaturation

    Loss of protein structure and function due to environmental changes.

  • Nucleic acids

    Polymers of nucleotides that store and transmit genetic information.

  • DNA (Deoxyribonucleic acid)

    Double helix nucleic acid storing genetic instructions.

  • RNA (Ribonucleic acid)

    Nucleic acid involved in gene expression and protein synthesis.

  • Nucleotide

    Monomer of nucleic acids; consists of a sugar, phosphate group, and nitrogenous base.

  • Gene

    Segment of DNA that codes for a protein.

  • Gene expression

    Process by which information from a gene is used to synthesize a functional product.

  • Hydrophobic vs. hydrophilic

    Hydrophobic molecules repel water; hydrophilic molecules attract water.

  • Saturated vs. unsaturated fatty acids

    Saturated have no double bonds; unsaturated have one or more double bonds affecting fluidity.

  • Trans fat

    Unsaturated fats with trans double bonds; associated with health risks.

  • Anabolic steroid

    Synthetic variants of testosterone that promote muscle growth.